In 1999, Ann Marie Carey made a preliminary attempt at laser color marking on niobium bowls, which made laser color marking of metal crafts and jewelry feasible.
Laser color marking makes the presentation effect of the pattern more diversified. The objects to be marked bid farewell to monochrome, enhance the sense of color hierarchy, lifelike images, improve the quality of products, and is an innovation of traditional technology. Since then, the application scope of laser color marking has been expanding, and it has become a new technological means to enhance the added value of products.
The reason why people's eyes can distinguish different colors is that when light hits the surface of an object, it reflects light of different wavelengths. These lights of different wavelengths are captured by naked eye cells. After being processed and resolved by the brain, they produce feelings of different colors. Returning to stainless steel, after laser treatment, you can get all kinds of colors. The reason is the same.
Laser color marking adds new color to stainless steel
Analyzing the principle of color development of stainless steel from its physical properties, there are no more than three ways that stainless steel changes before and after laser processing:
1. Formation of colored oxide
2. Under the action of chemistry, electrochemistry or laser, an extremely thin colorless transparent oxide film is formed on the surface of stainless steel. If the oxide film produces interference effect, it can show color on the surface
3. A mixed state of colored oxide and oxide film
Under the action of laser heat source, the surface of stainless steel for laser color marking will generate colored oxide or a colorless and transparent oxide film, which will show various colors due to the film interference effect of light. This is the basic principle of stainless steel color marking. In short, under the action of laser, the surface of stainless steel will generate laser thermal effect, and the surface of stainless steel will also show different colors due to different laser energy.